Dreams are intriguing, that’s a fact. Although their interpretation dates back to the dawn of time, our current knowledge comes from Antiquity. Since always, the Greeks considered dreams as a passage between the world of the gods and that of men. Dreams were thus scrutinized, interpreted, archived, and sometimes even induced by special rituals, in what is called the magic of dreams or Oniromancy. Introduction.
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Dreams before the Greeks
In Antiquity, the Babylonians and Assyrians already considered dreams as messages sent by gods or spirits. They kept dream catalogs, where each vision was associated with a precise meaning. The Egyptians, for their part, had entire papyri dedicated to the interpretation of dreams, often linked to the will of the gods or omens for the pharaoh. These cultures already practiced a form of oneiric divination, but their approach remained primarily religious.
What distinguishes the Greeks is that they integrated this tradition into philosophical and medical reflection. Homer and Hesiod mentioned dreams as messages from the gods, and Pythagoras considered them a way to access hidden truths.
Dreams as a bridge between mortals and gods
For the Greeks, a dream is not a mere nocturnal mirage. It is a message, a vision, sometimes even a warning.
The Greeks gave a name to the masters of dreams: the Oneiroi. Their lineage is still somewhat unclear: they are either the sons of Nyx (Night itself) and Erebus (god of darkness), or the sons of Hypnos (god of sleep) and Pasithea (goddess of hallucinations). In any case, among them, one name is particularly well known: Morpheus, the one who shapes dreams and gives them familiar faces. Under his hand, the sleeper sees known beings, landscapes, or omens appear. But he is not the only one to reign over this world. His brothers, Phantasos and Ikelos, manipulate respectively unreal visions and nightmares. These triplets (although other versions say there were more) breathe images to mortals that they must decipher upon waking.
For a Greek, a dream is never just a reflection of the unconscious. It is an open door to another reality, a special space where gods and spirits communicate with men. A message from Zeus, a vision of Apollo, or an appearance of Hades can contain a crucial revelation. But not every dream is good to follow, as Agamemnon learned. Some are deceptive, sent to sow confusion. In the Odyssey, Homer describes two gates through which dreams enter the world of the living: the ivory gate, through which illusions pass, and the horn gate, which lets in authentic visions.
The Greeks thus live with this uncertainty: how to distinguish a true dream from a mere illusion? For that, one must know how to interpret them, and some devoted their lives to making it an art.
Oniromancy, or the interpretation of dreams
Thus was born Oniromancy, the art of reading and understanding dreams. For those who know how to interpret it, the dream becomes an open book on the future or a compass to understand the present.
In Greek cities, Oniromancy is a recognized practice, consulted by kings as well as travelers. Some dreams are considered obvious: seeing a snake announces betrayal, glimpsing a calm sea is an omen of serenity. But others are more complex and require an expert eye. The seers, or oneiropoles, hold this role. Among them, one name marked history: Artemidorus of Daldis. This 2nd-century AD Greek devoted his life to compiling the meanings of dreams in a monumental work: The Oneirocritica. This book, a true manual of interpretation, is based on the idea that each dream must be analyzed according to the dreamer’s context. A king and a merchant will not see the same omens in a storm at sea, because their destinies differ, even though their dreams appear identical.
Source: Odysseum
Interpretation methods vary according to traditions. Some dreams are classified into precise categories: prophetic dreams (which announce the future), symbolic dreams (which require interpretation), and ordinary dreams (which are only echoes of daily life). The Greeks attach great importance to details: seeing one’s teeth fall out is perceived as a sign of death in the surroundings, dreaming of theft announces financial loss. These interpretations are not fixed; they evolve depending on the context and the individual who dreams.
Oniromancy is not limited to specialists. In Antiquity, everyone tries, on their own scale, to understand their dreams. Temples, especially those of Apollo and Asclepius, are privileged places to seek answers to nocturnal visions. But to obtain a meaningful dream, one must know how to induce it. This is where Incubation comes into play, a practice where the sleeper settles in a sacred place to await a divine message.
Incubation, or when sleep becomes ritual
This practice, called Incubation, is based on a simple idea: by sleeping in a sacred place, closest to the gods, the mortal can enter into direct contact with the divine.
The temples of Asclepius, god of medicine, are the most famous for these nights of Incubation. The sanctuary of Epidaurus, nestled in the heart of the Peloponnese, is one of the most frequented. Men and women sometimes travel hundreds of kilometers to get there, for an obvious reason: to find a remedy for their suffering or illness. Upon arrival, they follow a precise ritual. Before being able to lie down in the abaton, a room reserved for dreamers, they must purify themselves. Ritual baths, offerings, and prayers always precede the sacred sleep. Only after these preparations can the pilgrim fall asleep under the god’s protection.
When night falls, the ritual begins. It is said that Asclepius appears in person to the dreamers, accompanied by sacred snakes (a symbol of regeneration) that lick their wounds to heal them. Others receive darker visions, whose meaning must be interpreted. In the morning, the temple priests listen to each account and provide an explanation. If the message is clear, the patient leaves with the god’s prescription to follow. In other cases, sacrifices or additional prayers are recommended to appease the deity and obtain a new vision.
That said, Incubation is not reserved for the sick. Some come seeking advice, an answer to a troubling question. The dream then becomes a compass to illuminate the dreamer’s path.
The magic of dreams in daily life...
Like all magics, Oniromancy is lived daily. This knowledge and interpretation moved out of temple walls and into homes. And with it, attempts at manipulation more than decoding.
Indeed, some seek to influence their dreams, to provoke a favorable vision or ward off nightmares. For this, amulets and rituals exist. The Greeks hang pieces of coral, a laurel leaf, or statuettes of Hermes, the messenger of the gods and guide of souls. Before falling asleep, some whisper prayers to the Oneiroi to send them a dream bearing answers.
But beware, when talking about dreams, nightmares are also involved, which are feared. To protect against them, circles of flour are drawn around the bed, herbs are burned, or incantations are recited to ward off malevolent spirits.
The Greeks thus live in a world where sleep is never meaningless. Every night is an adventure, a silent conversation between men and gods, a territory to explore where sometimes the decisions of the next day are played out. At dawn, the dream fades, but its message remains, ready to be interpreted by those who know how to listen.
... Up to manipulation
Man cannot resist temptation. So some Greeks saw it as a tool for manipulation to achieve their ends. After all, Zeus did it to urge Agamemnon to attack Troy, which led to his downfall. Those who mastered the art of influencing dreams, whether by word, cunning, or ritual practices, had the power to steer others’ decisions.
One of the most widespread forms of this manipulation was onairoplokía (ὀνειροπλοκία), the art of "weaving" dreams to convince someone to act in a certain way. Seers, priests, and political figures could claim to have received a prophetic dream and use it as a weapon of influence. By announcing a vision where a god commanded a specific action, they could sway strategic decisions. A hesitant king about to go to war could thus be convinced that the gods assured him victory, just as a citizen could be pushed to support a leader under the pretext that a dream revealed a favorable omen.
In some cases, this manipulation went further with practices related to phantasmatopoiía, meaning the "creation of apparitions." This technique aimed to implant deceptive visions in a sleeper’s mind, using rituals or incantations to make them see images they would take for real. Some sorcerers and priests were reputed for their ability to induce terrifying or inspiring dreams remotely. A political rival could thus be assailed by nightmares pushing him to abandon a project, while a disciple could be comforted in his faith by a carefully influenced divine vision.
Dream interpretation was also fertile ground for manipulation, especially within chresmology, the art of compiling and interpreting oracles and omens. Since the Greeks attached great importance to signs sent by the gods, a dishonest seer could easily steer his explanation to serve his own interests. A dream announcing a rough sea could be translated as a warning against a journey, or conversely, as an invitation to face trials with courage. These subtle adjustments allowed interpreters to guide the decisions of those who consulted them.
Finally, another more insidious form of manipulation came through goetía practices, a type of magic intended to influence the world of spirits and illusions. While this discipline encompassed many occult practices, it also included the possibility of diverting dreams to sow confusion. This term was later used to designate magic related to spirits and demons, notably in medieval occult traditions. By the way, for the record, the term goetia simply means "witchcraft," especially related to necromancy and illusions. It was only from the Little Key of Solomon that Goetia became exclusively associated with demons.
Aristotle and the philosophical approach
Aristotle, Greek philosopher of the 4th century BC, devoted several treatises to the phenomena of sleep and dreams, notably On Sleep and Sleeplessness, On Dreams, and On Divination in Sleep. Unlike his predecessors who saw dreams as divine messages, Aristotle adopts a more naturalistic and rational approach.
In his treatise On Dreams, he defines the dream as an activity of the imagination occurring during sleep, resulting from residues of sensory perceptions. According to him, when we sleep, sensations perceived during the day leave impressions which, once the senses are at rest, are reactivated by the imagination, thus producing dream images. Aristotle emphasizes that these dreams are not sent by the gods but are natural phenomena arising from our sensory experience. However, in On Divination in Sleep, Aristotle examines the possibility that some dreams may have prophetic value. He distinguishes three types of relationships between dreams and real events:
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The sign: the dream precedes an event and indicates it.
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The cause: the dream is the direct cause of the event.
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The coincidence: the dream and the event occur simultaneously without causal link.
Aristotle is also one of the first to mention the phenomenon of lucid dreaming. He observes that, during sleep, it is possible to be aware that one is dreaming, noting that "often, when one sleeps, there is something in the soul that says what appears is a dream." This early observation paves the way for later studies on consciousness and perception in the dream state.
Thus ends this presentation. Even today, the dream remains an elusive space, between science and imagination, between subconscious and intuition. But the Greeks had no doubt: the night brings counsel, but one must know how to listen to what it has to tell us.
